nStor 4100FS, User Manual

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Chapter 4 - SAN Solution Strategies
Active-Active:Dual Port Mode for SAN
74
Hubs Disabled
In the following illustrations, the two controllers are configured in an Active-Active
Dual Port mode with the internal hubs disabled.
In the example below, two hosts are connected via two independent switches.
Using external switches supports higher bandwidth, since the host ports are not
required to share bandwidth on a loop.
Host 2
FC HBA FC HBA
Host 1
Switch 1 Switch 2
FC HBA FC HBA
See's LUN 1 & LUN 2 See's LUN 1 & LUN 2 See's LUN 1 & LUN 2 See's LUN 1 & LUN 2
LUN 1 LUN 1 Active Active Active Active LUN 2 LUN 2
NexStor 4120FS
Host I/O
Connectors
Disk I/O
Connectors
JFS RAID Controller
SEP
T= Location of internal termination
T T
Controller 1 (A)
SAF-TE Disk I/O
Disk CH1
Drives 7 - 12
Drives 1 - 6
Disk CH2 Disk CH0 Disk CH3
FC2 FC1
P1 P2
CH 1 CH 2
P3 P4
HOST I/O
JFS RAID Controller
Controller 2 (B)
Disk CH1 Disk CH2 Disk CH0 Disk CH3
FC2 FC1
T T
T
T
SEP
T T
Disk I/O
CH 0 CH 3
4100FS.book Page 74 Tuesday, July 8, 2003 4:35 PM